[linux-lvm] pvmove with a clustered VG

[linux-lvm] pvmove with a clustered VG

[Jeremy Lyon]

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I wasn't sure which list to, so I chose both cluster and lvm.

My current configuration:
2 Node RHEL 5.2 cluster with multiple GFS on top of logical volumes in one
volume group.

# rpm -q cman lvm2 lvm2-cluster kmod-gfs
cman-2.0.84-2.el5
lvm2-2.02.32-4.el5
lvm2-cluster-2.02.32-4.el5
kmod-gfs-0.1.23-5.el5

I need to move a PV out of this volume group so I attempted to run pvmove
/dev/sdk1 but errors about locking on the other node.  I assumed this was
because of the multiple GFS file systems being used on both nodes (services
were spread across the nodes).  So I relocated all services to one node and
even stopped rgmanager, gfs, clvmd and cman on the idle node to make sure
that no locks would remain open.

I still had issues with running the pvmove.  I saw these messages:

Sep 24 17:56:48 nodea kernel: device-mapper: mirror log: Module for logging
t
ype "clustered-core" not found.
Sep 24 17:56:48 nodea kernel: device-mapper: table: 253:31: mirror: Error
cre
ating mirror dirty log
Sep 24 17:56:48 nodea kernel: device-mapper: ioctl: error adding target to
ta
ble

And after about 14% of the move was completed, there was another locking
message and many processes went into an uninteruptable sleep state.  Load on
the server shot up to around 80.

I finally had to reboot the node and run pvmove --abort to get everything
back to working condition.

Is it not possible to run pvmove on a clustered VG?  Any help would be
appreciated.

-Jeremy

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[linux-lvm] Re: [Linux-cluster] pvmove with a clustered VG

[Milan Broz]

Jeremy Lyon wrote:
> Is it not possible to run pvmove on a clustered VG?  Any help would be
> appreciated.

Hi,
basic pvmove operation on clustered VG is supported since RHEL4.7
and should be available for RHEL5.3 too.

But not yet for mirrored LV, only for linear mapped LVs.

If you have clustered mirror module available, it can run online,
otherwise you have to deactivate VG (and pvmove run exclusively on one node).

Milan
--
mbroz@redhat.com